Message-ID: <3BFAB25B.2080200@zytor.com>
Date: Tue, 20 Nov 2001 11:43:23 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
Organization: Zytor Communications
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To: Andries.Brouwer@cwi.nl
CC: linux-kernel@vger.kernel.org
Subject: Re: Linux can use a mountpoint for 2 Filesystems
In-Reply-To: <UTC200111201941.TAA317995.aeb@cwi.nl>
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Sender: linux-kernel-owner@vger.kernel.org

Andries.Brouwer@cwi.nl wrote:

> hpa:
> 
> 
>>There are real reasons to overmount a filesystem.  It's getting to be
>>a usability problem, probably because Linux (UNLIKE MOST OTHER UNIXES)
>>didn't allow it until just recently.  This change caused some
>>problems, including with the automount daemon.  I would like to see an
>>option to mount(8) to allow it, by default disallow by policy.
>>
> 
> mount(8) does not necessarily have such information:
> /etc/mtab is just a random file with random contents,
> and /proc/mounts need not exist.
> 
> The cleanest way to do what you suggest would be to make the kernel
> refuse an overmount unless the mount(2) flags included the
> "overmount" flag.
> 


Agreed.

	-hpa


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